A Ray Of Light Falls On A Plane Mirror.When The Mirror Is Turned About An Axis At Right Angle To The Plane Mirror Through 30 Degrees,The Angle Between The Incident Ray And Original Reflected Ray Is 75 Degrees,The Angle Between The Incident Ray And New Reflected Ray Is?
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Answer:
105°
Explanation:
I suggest you roughly make the figure somewhere before reading the explanation.
in the figure
GD is the original position of the mirror.
BE is the new position.
the angle between the two positions of the mirrors is given in the question as 90°
AO is the incident ray.
OC is the old reflected ray.
OF is the new reflected ray.
the angle AOC=75°(given)
angle GOA=DOC=GOF
GOA+COD+AOC=180°(angles on a straight line)
GOA+GOF=180°-75°(COD=GOF as proved above)
GOA+GOF=105° –Ans
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